/**
 * index.js 自定义vue自动指令
 * 如需页面元素实现某个指令，只需在对应的元素上添加"v-xxx"属性即可，如"v-ioc-tooltip"指令可悬浮弹出自定义tooltip
 */
import Vue from 'vue';

// v-app-drag: 弹窗拖拽
Vue.directive('app-drag', {
  bind (el, binding, vnode, oldVnode) {
    this.$log.info(el, binding, vnode, oldVnode);
    const dragDom = el;
    dragDom.style.cursor = 'move'

    // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
    const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

    dragDom.onmousedown = (e) => {
      let draggable = el.getAttribute('data-draggable');
      if (!draggable) {
        return;
      }
      // 鼠标按下，计算当前元素距离可视区的距离
      const startX = e.clientX;
      const startY = e.clientY;

      // 获取到的值带px 正则匹配替换
      let styL, styT

      // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
      if (sty.left.includes('%')) {
        styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100) // eslint-disable-line
        styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100) // eslint-disable-line
      } else {
        styL = +sty.left.replace(/\px/g, '')
        styT = +sty.top.replace(/\px/g, '')
      }

      document.onmousemove = function (e) {
        // 通过事件委托，计算移动的距离
        const l = e.clientX - startX;
        const t = e.clientY - startY;

        // 移动当前元素
        dragDom.style.left = `${l + styL}px`
        dragDom.style.top = `${t + styT}px`
      }

      document.onmouseup = function () {
        document.onmousemove = null
        document.onmouseup = null
      }
    }
  },
})